Yeah, the dark horizons article was fairly misleading. It was more speculation than anything. It was and most people are just assuming at this point that Roswell won't be back next year. However, there still has been no official word from UPN or the Roswell producers as to what the future holds for Roswell. I know that the two hour finale is also going to be a pilot for season 4. And there is talk of some cast changes if it does return. (I don't think they'll replace any main characters... most of them would still be under contract.) And Johnathan Frakes also mentioned the possibility of a movie.... but that's just 'talk' as of now.
There are two places you can place your vote for the return of Roswell... scifi wire
and on the save that show website...(here you can vote once a day everyday) vote here
Your votes really do count on both places. as the networks will be given the results.